At first, start and begin seem to mean the same thing — both refer to the act of doing something for the first time. But in everyday English, they are used in slightly different ways, depending on tone, formality, and context.
Start is more informal and conversational. It is the word we use most often in daily speech. You start your homework, start a game, or start feeling sleepy. It is also commonly used for machines and actions. You start a car, start a timer, or start the washing machine. Because of this, start often feels more immediate and practical.
Begin sounds more formal and deliberate. It is frequently used in writing, speeches, instructions, and announcements. A teacher may say, “Let us begin the lesson,” or a book may begin with an introduction. Begin is often chosen when something feels planned, organised, or important.
There is also a small emotional difference. Start can suggest sudden action, while begin often implies a thoughtful or orderly process. You might start running when it rains, but begin a long-term project after careful planning.
In most cases, both words are correct. Use start for everyday actions, and begin when you want your language to sound calm, formal, or intentional.